LINEAR AND NONLINEAR RESPONSE ANALYSES OF OFFSHORE STRUCTURES UNDER RANDOM WAVE AND CURRENT LOADING

This paper investigates effects of nonlinearities which arise from the drag force term of the Morison equation on response values of an example monopod tower. In the investigation, nonlinearities with stochastic character as well as large deformations are taken into account. A time domain analysis is carried out using time dependent hydrodynamic damping which arises from the fluid-structure interaction. A traditional linearized spectral analysis if also carried out and the results are compared with those obtained from the time domain analysis. Since the hydrodynamic damping and the applied force are coupled with the response velocity an iterative procedure is used to solve the dynamic equilibrium equation. Discrete Fourier transform is used to calculate response spectra from the results of the time domain analysis.

• Supplemental Notes:
  • ISOPE 94, 4th Intl Offshore & Polar Engng Conf; 10-15 April 1994; Osaka, Japan. Sponsored by ISOPE, USA et al. Procs. Pubs by ISOPE, ISBN 1-880653-13-3. Vol III, p 328 [6 p, 13 ref, 4 fig]
• Authors:
  • Karadeniz, H
• Publication Date: 1994

Language

• English

Subject/Index Terms

• TRT Terms: Damping (Physics); Nonlinear systems
• Uncontrolled Terms: Nonlinearity
• Old TRIS Terms: Random seas; Wave loads on structures
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00709396
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM